<!DOCTYPE html>
<html lang="zh">
  <head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
  </head>
  <body>

  </body>
  <script>
    var a = []
    for (var i = 0; i < 10; i++) {
      a[i] = function() {
        console.log(i);
      }
    }
    // console.log(a);
    // console.log(i);
    a[1]() // 10
    a[2]()
  </script>
</html>